/////////////////////////////////////////////////////////////////////////////
// Original code from libhdfs3. Copyright (c) 2013 - 2014, Pivotal Inc.
// All rights reserved. Author: Zhanwei Wang
/////////////////////////////////////////////////////////////////////////////
//  Modifications by Kumo Inc.
// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//



#pragma once

#include <string>
#include <utility>
#include <memory>

#include <turbo/times/time.h>
#include <kmhdfs/common/lru_map.h>
#include <kmhdfs/common/session_config.h>
#include <kmhdfs/network/socket.h>
#include <kmhdfs/server/datanode_info.h>

namespace Hdfs {
    namespace Internal {
        class PeerCache {
        public:
            explicit PeerCache(const SessionConfig &conf);

            std::shared_ptr<Socket> getConnection(const DatanodeInfo &datanode);

            void addConnection(std::shared_ptr<Socket> peer, const DatanodeInfo &datanode);

            typedef std::pair<std::shared_ptr<Socket>, turbo::Time> value_type;

        private:
            std::string buildKey(const DatanodeInfo &datanode);

        private:
            const int cacheSize;
            int64_t expireTimeInterval; // milliseconds
            static LruMap<std::string, value_type> Map;
        };
    }
}
